"Fifteen hundred years ago everybody knew the Earth was the center of the universe. Five hundred years ago, everybody knew the Earth was flat, and fifteen minutes ago, you knew that humans were alone on this planet. Imagine what you'll know tomorrow." - Kay, Men in Black

I'd say pick out a story that interests you, and then illustrate it. It perhaps would be a good idea to announce what story your are illustrating to avoid conflicts, but I don't see the harm in doubles.